unused Block of Four 20h. black and red on yellow handstamped in dull violet, a block of four, the top right stamp without handstamp , fresh and fine mint. Unique. Holcombe Certificate (1990). S.G. M5A/5Aa, #2500+. Photo
unused Block of Four 20h. black and red on yellow handstamped in dull violet, a block of four, the top right stamp without handstamp , fresh and fine mint. Unique. Holcombe Certificate (1990). S.G. M5A/5Aa, #2500+. Photo
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